[lld] [lld][ELF] Simplify handleLibcall. NFC (PR #78659)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld

Author: Sam Clegg (sbc100)

<details>
<summary>Changes</summary>

I noticed this while working on #<!-- -->78658

---
Full diff: https://github.com/llvm/llvm-project/pull/78659.diff


1 Files Affected:

- (modified) lld/ELF/Driver.cpp (+1-7) 


``````````diff
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index 5ccc65600dcb91..07f4263c90e62b 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -2081,13 +2081,7 @@ static void handleUndefinedGlob(StringRef arg) {
 
 static void handleLibcall(StringRef name) {
   Symbol *sym = symtab.find(name);
-  if (!sym || !sym->isLazy())
-    return;
-
-  MemoryBufferRef mb;
-  mb = cast<LazyObject>(sym)->file->mb;
-
-  if (isBitcode(mb))
+  if (sym && sym->isLazy() && isa<BitcodeFile>(sym->file))
     sym->extract();
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/78659